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RUBBER COMPOSITION FOR TREADS AND PNEUMATIC TIRE

  • US 20180134080A1
  • Filed: 10/18/2017
  • Published: 05/17/2018
  • Est. Priority Date: 11/16/2016
  • Status: Active Grant
First Claim
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1. A pneumatic tire, comprising a tread formed from a rubber composition for treads, the rubber composition comprising:

  • a polybutadiene; and

    a terpene resin having a glass transition temperature (Tg) of 40°

    C. to 90°

    C.,the polybutadiene satisfying the following conditions (A), (B), and (C);

    (A) a ratio (Tcp/ML1+4, 100°

    C.) of 5% by mass toluene solution viscosity (Tcp) to Mooney viscosity (ML1+4, 100°

    C.) is 0.9 to 2.3;

    (B) a stress relaxation time (T80) is 10.0 to 40.0 seconds, which is a time required for torque to decay by 80%, where 100% represents torque at the end of a ML1+4, 100°

    C. measurement; and

    (C) a molecular weight distribution (Mw/Mn) is 2.50 to 4.00.

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